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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 12d

📣Don’t miss out! You can still register for the PO2 Second Workshop!🌊 We invite the #ocean#oxygen community to our #PO2workshop. Announced Past Global Changes, Past Ocean Oxygenation and NC Museum of Natural Sciences.
Scan the QR for details on our #registration. @pages-ecn.bsky.social

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 29

Pretty cool, right? Can you think of other shell features or clues that could serve as proxies? Share your ideas in the comments!
Post by @sofigerina.bsky.social @dharmarx.bsky.social sebastiangarrido
#pastoceanoxygenation #scicomm #paleoclimate #proxies #foraminifera #timemachines

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 29

Scientists study how micro-organisms such as foraminifera respond to today’s ocean conditions, then use those patterns to infer what oceans were like thousands or even millions of years ago. By comparing past and present, they can reconstruct Earth’s climate history.

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 29

Hi again, Oxyguys!!🤓🌍🌊“Proxies: Windows into the Past” Did you know scientists can uncover past climates using proxies? These are measurable clues preserved in marine sediments—like tiny “time machines” recording signals of temperature, oxygen, or salt. @pages-ipo.bsky.social @pages-ecn.bsky.social

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 14

¿Aprendiste algo nuevo o tienes preguntas? déjala en los comentarios! Ilustración y textos por María Yolanda Nuñez; textos y edición por Sofía Barragán Montilla @sofigerina.bsky.social
#pastoceanoxygen #scicomm #bilingual #paleoecology #oxygen #marinescience #paleoscience #darkoxygen #paperalert

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 14

Estos hallazgos podrían cambiar lo que sabemos sobre la vida marina y cómo el océano abisal se mantiene oxigenado. Impresionante, ¿verdad?

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 14

El estudio se hizo en una zona cubierta de nódulos polimetálicos, por lo que los autores plantean que el alto voltaje de los nódulos dio lugar a la electrólisis, un proceso por el cual se descomponen las moléculas de agua en oxígeno e hidrógeno.

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 14

Investigadores instalaron cámaras bentónicas en el fondo marino abisal del Océano Pacífico para cuantificar el oxígeno en un periodo de tiempo y ¡los datos muestran más oxígeno del esperado! lo que sugiere que en las profundidades del océano también se produce O₂

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 14

📑🔬¿Sabes qué es el oxígeno oscuro? Un estudio publicado en Nature Geoscience muestra un descubrimiento sorprendente: más oxígeno del esperado en el océano profundo. Aquí, el oxígeno proviene de la ventilación de aguas menos profundas y es consumido por organismos para respirar y oxidar materia.

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 12

Impressive right? If you learned something new or have other questions leave it in the comments, we will do our best to reply. This is a post Maria Yolanda Nuñez (Illustration and texts) and @sofigerina.bsky.social (text and edits).

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 12

Since the chambers were located in a polymetallic nodule-covered zone. Their hypothesis: high voltage of nodules enabled electrolysis to break down water molecules into oxygen & hydrogen. The findings could change what we know about ocean life, chemistry & how the abyssal ocean remains oxygenated.

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 12

The researchers installed benthic chambers in the Pacific Ocean abyssal seafloor to quantify oxygen over a period of time. The data shows more oxygen than expected, suggesting additional O2 was being produced!

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 12

📑🔬You asked about dark oxygen, here it is! In Nature Geosciences, a study shows a striking discovery: more oxygen than expected in the abyssal ocean. Here, oxygen is mostly supplied by ventilation from shallower waters, & it is consumed by organisms through respiration and oxidation of matter.

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 9

🗣📢Abstract submission is now open for the OSM 2026 (Ocean Science Meeting) We invite the #ocean #isotope community to our MASIS - SCOR session. Join us at the conference. 👉 Scan the QR for details on our session and travel #funding options. #OSM26 🌊

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 8

📣 Abstract submission is open for the Ocean Science Meeting!🌊We invite the #ocean #oxygen community to our PO2 session on #past, #present, & #future #deoxygenation. Join us at the conference. 👉 Scan the QR for details on our session and travel #funding [email protected] @agu.org #OSM26

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Reposted by PO2 - Past Ocean Oxygen Working Group

Sofía Barragán-Montilla @sofigerina.bsky.social · Jul 20

🧐 You can also read more about it here www.marum.de/en/Oxygen-AM... @dharmarx.bsky.social @oceano2.bsky.social @kielunimarine.bsky.social @pastoxygen.bsky.social @geolatinas.bsky.social

Tracking Atlantic Meridional Overturning Circulation using benthic foraminifera

www.marum.de

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 5

📖 Read the latest and previous editions here:
👉 www.pastglobalchanges.org/science/wg/po2/newsletters
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Sign up for our mailing list here:
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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Aug 5

📣Exciting Announcement: PO2 Newsletter – 5th Edition is out! 🔬 🌊 🌏
We’re happy to share the new edition of the Past Ocean Oxygenation (PO2) Newsletter! This issue features updates on major events and recent research related to ocean oxygenation in the past. @pages-ipo.bsky.social

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Reposted by PO2 - Past Ocean Oxygen Working Group

Laura Cotton @lauraminifera.bsky.social · Jul 29

🎉Are you a mineralogist who also loves museums? 🎉
Come join the Natural History Museum Denmark! We are looking for an assistant professor and curator of mineralogy. Advert can be found below, but apply soon! Deadline is 11th August😱

candidate.hr-manager.net/ApplicationI...

211-0241/25-2N Tenure-track Assistant Professor and Curator in Mineralogy at Natural History Museum Denmark

candidate.hr-manager.net

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Reposted by PO2 - Past Ocean Oxygen Working Group

Sofía Barragán-Montilla @sofigerina.bsky.social · Jul 30

🤔 Did you know that with a weaker #AMOC tropical shallower waters got + oxygen in the last deglacial? 😱 Using benthic #forams, we explore how #AMOC influences Atlantic shallow circulation 🌊🐚🔬👩‍🚀 www.nature.com/articles/s41... @marumunibremen.bsky.social @natcomms.nature.com

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Reposted by PO2 - Past Ocean Oxygen Working Group

Sofía Barragán-Montilla @sofigerina.bsky.social · Jul 20

🚨Our new @natcomms.nature.com paper is out! 🤔Did you know that with a weaker #AMOC, tropical shallower waters got + oxygen in the last deglacial? Using benthic #forams, we explore how deep #AMOC influences Atlantic shallow circulation 🌊🐚🔬👩‍🚀 www.nature.com/articles/s41... @marumunibremen.bsky.social

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Reposted by PO2 - Past Ocean Oxygen Working Group

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Jun 11

📢The Past Ocean Oxygenation @pages-ipo.bsky.social Working Group is here! 🚤 We provide insights into the natural variability of seawater oxygen in key periods of the geological record & communicate the science behind oxygen reconstructions 🐳 PO2 is here! pastglobalchanges.org/science/wg/p...

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Reposted by PO2 - Past Ocean Oxygen Working Group

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · Jun 27

Hi again!📝¿Oxígeno Disuelto en el Océano (OD)? 🌊🤓¿Sabes qué es? Hablemos de algunos conceptos básicos que usaremos en nuestras futuras publicaciones para hablar de la oxigenación oceánica en el pasado. Los científicos usan equipos especializados para medir el OD en el océano. @pages-ipo.bsky.social

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Reposted by PO2 - Past Ocean Oxygen Working Group

MARUM @marumunibremen.bsky.social · Jul 17

New study: More oxygen in the oxygen-minimum zone associated with weaker Atlantic overturning circulation - now in Nature Communications.

@marumunibremen.bsky.social
@kielunimarine.bsky.social
@sofigerina.bsky.social

#ClimateChange #AMOC #OceanScience #Foraminifera #PaleoData

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Reposted by PO2 - Past Ocean Oxygen Working Group

Anya Hess @anya-hess.bsky.social · Jul 16

In this paper, we present new global calibrations for the I/Ca proxy for ocean oxygenation, with the first Pacific transect. By comparing data from planktonic foram species that live at different water depths, we gain a better understanding of the proxy and its relationship to O2

#paleoceanography

South-North cross section through the eastern tropical Pacific oxygen minimum zone. It shows the north and south lobe of the oxygen minimum zone, separated by the equatorial undercurrent. The Peru-Chile current and California Current ventilate the near-surface waters, North Pacific Intermediate waters bring low-oxygen waters to the northern lobe at ~550m, and Antarctic Intermediate Waters ventilate the southern lobe at the same depth. The oxygen minimum zone is fueled by Ekman upwelling and remineralization of sinking organic material.

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